Illinois Gov. Pat Quinn signed a measure Sunday making his state the fourth and most populous to permit illegal immigrants to drive. Proponents say the measure will improve safety on the roads, but critics warn of the potential for identity fraud. Below are the requirements for receiving a permit.

— Submit to facial recognition software, but no fingerprinting.

— Provide proof of written signature, proof of date of birth and a letter of ineligibility for a Social Security number.

— Show valid passport from a home country or a consular identification card, and two documents that show a minimum one-year residency in the state.

— Receive drivers training and undergo vision screening, written and driving tests.

— Purchase insurance.

The purple-bordered card will be different than regular licenses, and valid only for driving purposes. It cannot be used as a form of identification, meaning licenses can't be used to buy a firearm, register to vote or board a plane.

Applicants who satisfy all requirements will receive their license by mail, not at state facilities. The state will begin accepting applications at least 10 months after the governor signs the bill. Each card will cost $30, the same cost of a regular license.